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Dimorphos

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DART finds binary asteroids exchange debris via slow 'cosmic snowballs'
space-exploration1 month ago

DART finds binary asteroids exchange debris via slow 'cosmic snowballs'

NASA's DART mission captured the first direct evidence that debris can move between the binary asteroid pair Dimorphos and Didymos, with 2022-era imagery showing fan-shaped streaks likely produced by material shed from Didymos and landing on Dimorphos. The ejecta traveled about 30.7 centimeters per second (12.1 inches per second), slow enough to deposit material rather than creating craters, indicating active surface evolution in a binary asteroid system. The findings, published in The Planetary Science Journal, complement other results showing DART altered Dimorphos’ orbit and slightly shifted the binary system’s orbit around the sun; the ESA Hera mission is set to survey the system later this year to further study the aftermath and improve planetary-defense models.

via Space|
#binary-asteroids#dart#didymos
DART impact nudges binary asteroid off its solar path
space1 month ago

DART impact nudges binary asteroid off its solar path

NASA's 2022 DART impact on Dimorphos not only shortened its orbit around Didymos (from 11h55m to 11h23m) but also nudged the entire Didymos–Dimorphos system onto a subtly different solar orbit, thanks to momentum from the ejecta which doubled the thrust. The system's solar-trajectory change is about 11.7 microns per second (roughly 1.7 inches per hour) and the orbit around the Sun shifted by about 0.15 seconds; the findings, published in Science Advances, confirm asteroid deflection is feasible and underscore the value of NEO Surveyor and amateur occultation observers who helped quantify the change. Dimorphos density ~1,540 kg/m3; Didymos ~2,600 kg/m3.

via Yahoo|
#asteroid-deflection#dart#didymos
Tiny nudge, big consequence: DART subtly shifts binary asteroid's solar orbit
space-exploration1 month ago

Tiny nudge, big consequence: DART subtly shifts binary asteroid's solar orbit

NASA’s Double Asteroid Redirection Test (DART) slammed into the small moon Dimorphos in 2022, shortening its orbit around the larger asteroid Didymos from 11 hours 55 minutes to 11 hours 23 minutes. A new analysis shows ejecta from the cratering boosted the thrust by a momentum-enhancement factor of about two, meaning the ejecta carried away momentum that amplified Dimorphos’ deflection. Because Dimorphos is bound to Didymos, the extra push nudged the whole binary’s orbit around the Sun, changing their heliocentric orbital period by about 0.15 seconds. The result, based on ground-based observations including 22 amateur stellar occultations, supports the feasibility of asteroid deflection and informs future efforts, including NASA’s planned Near-Earth Object Surveyor to find more near-Earth objects after 2027.

via Space|
#dart-mission#didymos#dimorphos
DART’s hit nudged the Didymos–Dimorphos pair into a slightly faster solar orbit
space1 month ago

DART’s hit nudged the Didymos–Dimorphos pair into a slightly faster solar orbit

NASA’s DART spacecraft’s impact on Dimorphos altered the binary asteroid system’s motion around the Sun: their orbital period around the Sun shortened by about 0.15 seconds (from ~770 days) due to momentum transfer and debris ejection (~16 million kg). The measured change in orbital speed was ~11.7 microns per second, marking the first time a human-made object subtly altered a celestial body’s solar orbit; follow-up Hera observations will study the aftermath.

via CNN|
#asteroid-deflection#dart#didymos
DART makes history by nudging an asteroid's path around the Sun
space1 month ago

DART makes history by nudging an asteroid's path around the Sun

NASA's DART spacecraft’s 2022 impact on Dimorphos not only shortened the moonlet's orbit around Didymos but also measurably altered the Didymos–Dimorphos system's orbit around the Sun, changing the pair's solar trajectory by about 11.7 microns per second (roughly 1.7 inches per hour). This first-of-its-kind result supports planetary-defense research by showing how small nudges can accumulate to influence long-term hazard assessments.

via Engadget|
#dart#didymos#dimorphos
Tiny orbital nudge proves NASA's asteroid defense works
science1 month ago

Tiny orbital nudge proves NASA's asteroid defense works

NASA's 2022 DART mission deliberately hit the asteroid Dimorphos, nudging its orbit by a tiny 0.15-second change in its solar orbit. The new analysis confirms that a kinetic-impact deflection can measurably alter a celestial body's path and provides crucial data for planning future planetary-defense efforts, though the test was not in response to any actual threat.

via France 24|
#dart#dimorphos#nasa
DART Collision Nudges Didymos-Dimorphos’ Solar Path
space1 month ago

DART Collision Nudges Didymos-Dimorphos’ Solar Path

A Science Advances study shows NASA’s DART impact on Dimorphos changed not only Dimorphos’ orbit around Didymos, but also the pair’s orbit around the Sun by about 0.15 seconds — the first measurable change to a celestial body’s solar orbit caused by a human-made object. The team used radar, ground-based observations, and 22 stellar occultations to measure Didymos’ motion; debris momentum (momentum enhancement ~2) amplified DART’s effect. This validates kinetic impact as a planetary-defense technique and informs future missions like NASA’s NEO Surveyor.

via NASA (.gov)|
#dart#didymos#dimorphos
DART Impact Nudges Dimorphos Orbit, Extending Its Reach to the Sun
space-and-spaceflight1 month ago

DART Impact Nudges Dimorphos Orbit, Extending Its Reach to the Sun

New analysis of NASA’s DART results shows the kinetic impact not only altered Dimorphos’s orbit around Didymos but also shifted the binary system’s path around the Sun, slowing Dimorphos by about 11.7 micrometers per second and shortening the solar orbit by roughly 360 meters (about 0.15 seconds per year). The tiny change, inferred from radar and stellar occultations, provides the strongest evidence yet that kinetic impact can alter an asteroid’s solar trajectory, with ESA’s Hera mission expected to map the bodies to tighten measurements and improve planning for planetary defense.

via Gizmodo|
#asteroids#dart-mission#dimorphos
NASA's DART Mission Successfully Redirects Asteroid Dimorphos
science3 months ago

NASA's DART Mission Successfully Redirects Asteroid Dimorphos

NASA's DART mission successfully shifted the orbit of asteroid Dimorphos by crashing a spacecraft into it, but unexpected debris ejected from the asteroid, including large boulders, carried additional momentum and altered the asteroid's motion in unforeseen ways, highlighting the complex physics involved in planetary defense efforts. The upcoming Hera mission will further study these effects.

via Indian Defence Review|
#asteroid-deflection#dart-mission#dimorphos